Water-tube-circulating steam-boiler.



P. W. BURKE. WATER TUBE OIRGULATING STEAM BOILER.

APPLICATION FILED JULY 6, 1908.

Patented Sept. 29, 1908.

' To all whom it maytohcrn:

UNITED PEROYW. BURKE, OF CHICAGO, ILLINOIS.

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Be it known that I, PERCY 'W. BURKE, a

citizen of' the United States, residing at Chi-- cago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Water. Tube Circulating Steam-Boilers, of which the following is a specification.

tube and water-tubecirculating steam boiler.

The object of my invention is to provide for boxing in the fire -chamber and the smoke-chamber with water circulating and heating devices for economizing heat, securing greater efficiency and'prote'cting the grate j and brick side walls of thefurnace from ero sion by flame and hot gases. 1

By means of my improved construction and arrangement of parts I save and utilizethirty per cent. more of the heat produced by combustion of the fuel than: heretofore attainable withthe usualconstruction of firetube boilers, and at the same time secure more rapid circulation of water,

plates, grate and side walls of the and at the other end by union tees, coupling devices, may be readily removed in pairs and replaced when repairs are required, thus simplifying the operation of keeping the boiler in good working condition.

The combination and arrangement of parts constituting my invention willbe defined in the claims.

in the accompanying drawings, in which- Flgure 1 represents alongltudinal sectlon of a boiler furnace,'showing parts in side elevations Fig. 2 represents apartial transverse section andpartial front end elevation.

Fig. 3 represents a detail view on enlarged scale of part of the shaking grate and horiglrepresents an" zontal coil-at grate. enlarged detail view of thefunion-tee 'coupling devices for connecting circulating pipes at one endin pairs. v The fire-tube boiler A isset in the walls of the furnace B, in the usual manner with its i Specification of Letters Patent. Application filed July 6, 1908. Serial No. 442,074.

uicker, steam generation and better protectlon 10f- Patented. Sept. 29, 1908 rear end a inclosed in the wall in the smoke chamber 6 and its front end a overhanging the front wall in the usual manner and having a door opening into the smoke box to which the stack is connected. The furnace is provided with the usual ash-pit b and "doors'and with a bridge wall B, forming a 3 fire-box I)? in front, and a chamber 6, for This invention relates to a combined fire smoke or flame and products, in the rear, and making a passage to the fire-tubes opening through the rear end a of boiler A. The chamber 12 is closed at the bottom by brick or tile'b. A shaking or rocking grate C, is composed of bars pivotally connecting with a rodfc, which extends through the front wall and is pivotally connected to the operating lever c. A feed-water pipe D, having a valve d asses down through the top of boiler A near y to the bottom thereof. At the bottom and near the rear end of the boiler connects a blow-off pipe E which passes down through chamber 12 and is provided with a valve 6. This ipe E may connectwith any other blow-0E pipe, not here shown.

In order to utilize all the heat it is possible to get from the fuel I provide for boxing in the fire by means of circulating water tubes connected by return-bends and detachable union-tee coupling devices. The blow-0E pipe E, at the rearand about mid way betweenthe side walls of the furnace, is provided witha cross coupler f, f, to which are connected the two ends of pipe of two circulating sections or groups of coils F-F, forming one section, and FF forming the other l a section. The flat horizontal coil F is formed The details of construction are illustrated.

of parts of the two sections and extends longitudinally and transversely, atthe grate level, over the area of the furnace, the pipes extending through the bridge wall B and forming part of the grate surface in the fire-box. The section F-F is continued from the grate level up the left hand side wall to the top of the fire level and is there turned inward by a pipe-connection gin the front smoke box and connects with the front end of boiler A below the water line. In a similar manner the section FF is extended, forming a lining for the right hand wall of the. furnace and connecting by pipeg with boiler A. The pipes of the coil sections are preferably connected together in pairs at the front end by returnbends h of malleable iron, and at the rear end by union-tee coupling devices and nuts Z, the ends of the tees being closed by brass screw-plugs m as shown in Fig. at. The nuts Z are, in practice protected by asbestos cement as they are the only parts not directly watercooled where exposed to the fire or hot products. By means of the union-tees, repairs may be readily made. By taking apart two unions, two tubes and one return-bend may be lifted out from the hook plate support H at the side wall, and then new tubes can be screwed into the return bend and connected by the union-tees, thereby quickly repairing any part of a section and placing into operative condition.

The rocking bars of the grate C are supported at the ends by side rails L secured to the walls, and the tops of the bars are placed below the centers of the pipes of the horizontal coil F for better shaking out ashes and, also to make a corrugated grate surface. The water flowing through the pipes keep them comparatively cool, so that the coal will not clinker and mat on the grate.

lVater being supplied to the boiler A through feed pipe D, it will flow down through pipe E and fill the circulating coils F, F F until it is discharged through pipes g into boiler A. and the latter will be filled to the desired water level. The furnace being properly fired the main boiler and circulating coils will all be heated and water will be circulated from boiler A through pipe E and all of the coils back into the boiler at the connections 9. On account of the large number of coils, circulation will be quite rapid and water which is heated in any one pipe will be still more highly heated in the next adjoining pipe and so on through the system, thereby promoting rapid circulation and rapid generation of steam. On account of this rapid circulation the plates of boiler A will be kept at a comparatively low temperature and thereby prevented from warping or bagging as often occurs where circulating coils are not used. By means of the rapid circulation all scale making material will be passed with the water down through the blow-off pipe E and will be blown off when desired by opening valve 6. The boiler will thus be kept clean. By utilizing the heat that would otherwise be lost upon the brick walls and bottom of the furnace back of the bridge Wall, I save at lea st thirty per cent. of the heat of the fuel which would otherwise be lost.

By reason of the increased heating surface and rapid circulation of the water no force draft is necessary and therefore more perfect combustion of the fuel is obtained so that the boiler serves materially in abating the smoke nuisance. On account of slower and more perfect combustion no smoke will be thrown off from the boiler in the effort to obtain the maximum steam generating capacity.

It will be evident that my improved circulating coils may be readily fitted to an old fire-tube boiler thereby greatly increasing its steaming capacity at a small expense. The advantages above enumerated have been demonstrated by practical ope ation of my boiler.

Having thus described my invention, what I claim as new and desire to secure by Let ters Patent, is

1. The combination with a fire-tube steamboiler, of a blow-off pipe connecting with the bottom at the rear end of the same and extending down through the smoke chamber back of the bridge wall and having a valve, a flat horizontal coil or serpentine at the grate level and extending approximately the width and length of the fire-box and smoke chamber and having connection by two pipes with said blow-off pipe for feeding water to the coils, a vertical coil or serpentine lining the wall on each side of the fire-box and smoke chamber and connecting with said fiat coil, and, on opposite sides, with one end of the fire-tube boiler, and a shaking grate having the bars thereof placed between the water-tubes of the horizontal coil, substantially as described.

2. The combination with a furnace having a bridge wall, a lire-box in front thereof and a smoke chamber to the rear end of the furnace, of a fire-tube steam boiler set in the top of the furnace, a blow-off pipe connecting with the bottom at the rear end of the boiler and extending down through the smoke chamber, a flat horizontal coil at or near the grate level, extending through the area of the fire-box and smoke chamber and connecting by two pipes with said blow-01f pipe for receiving feed water therefrom, a vertical coil or serpentine covering each side wall to the fire line and connecting with the front end of the tubular boiler below the water line, the pipes of said coil or serpentine being connected in pairs at one end by return-bends and in pairs at the opposite end by union tee coupling devices, whereby any pair may be removed and replaced readily, for preparing the coil, the construction being such that the fire and hot products are boxed in on four sides by means of water circulating devices for economizing heat, substantially as described.

8. A water circulating and heat economizing boiler composed of water circulating coils on the bottom, and opposite sides and a tubular boiler at the top of the furnace for boxing in the fire and products 011 all sides and protecting the brick walls of the furnace, in combination with means for feeding water directly to the tubular boiler, a blow- In testimony whereof I affix my signature 01? pipe connecting with, and extending in presence of two Witnesses. down from, the bottom thereof, a connection from the bottom coil to said pipe and con- PERCY BURKE 5 nections for discharging Water from the side Witnesses: coils into the tubular boiler, substantially as A. W. MOLAREN,

described. A. L. LINGO. 

